JPH0774129B2 - Stabilized pesticide solid formulation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a solid agricultural chemical formulation in which the decomposition of a sulfonylurea herbicidal active ingredient is suppressed and stabilized.

[Conventional technology and problems]

Recently, a sulfonylurea herbicidal active ingredient was found to have high activity as an active ingredient of a herbicide in an extremely small amount, and the active ingredient itself is stable with almost no decomposition, but is Solid pesticide formulations, such as powders,
In the case of formulating into a wettable powder, granules, etc., decomposition of the active ingredient is remarkably promoted during storage of the preparation, and therefore a technique for suppressing and stabilizing the decomposition is demanded.

Conventionally, as a method for suppressing and stabilizing the decomposition of sulfonylurea herbicidal active ingredients, for example, JP-A-59-20
The methods described in JP-A-5305 and JP-A-61-56171 are known.

The former method is a method of stabilizing the active ingredient in a complex with β-cyclodextrin, but the expensive β
It has the drawback of being costly due to the use of cyclodextrins.

On the other hand, the latter method is a method of stabilizing an active ingredient in the form of a carboxylate salt or an inorganic acid salt, but this technique relates to an aqueous preparation and does not disclose a solid preparation at all. .

[Means for solving problems]

The present invention relates to a stabilized agricultural chemical solid preparation obtained by uniformly mixing a sulfonylurea herbicidal active ingredient, a vegetable oil or a substance selected from a high boiling point solvent (hereinafter referred to as an additive) and a mineral substance carrier. Is. That is, the present invention relates to a pesticidal solid preparation in which a sulfonylurea herbicidal active ingredient is significantly suppressed from being decomposed and stabilized by containing a specific additive in the pesticide solid preparation.

In the present invention, the mineral carrier is not particularly limited, and examples thereof include ordinary solid carriers such as clay, talc, bentonite, diatomaceous earth, calcium carbonate, and white carbon.

The vegetable oil is not particularly limited, but examples thereof include olive oil, linseed oil, cottonseed oil, soybean oil, corn oil and the like.

The high boiling point solvent is a solvent having a boiling point of 150 ° C. or higher, and in particular, one or a mixture of two or more aromatic hydrocarbons having a boiling point of 15 ° C.
It is preferably 0 to 350 ° C.

The additive in the present invention is a substance selected from the above vegetable oils or high boiling point solvents, and may be a mixture of vegetable oils and high boiling point solvents.

The sulfonylurea herbicidal active ingredient is not particularly limited, but is, for example, the following formula: Q-SO ₂ NHCONH-R (In the formula, Q is a phenyl group which may be substituted with various substituents, a benzyl group. Alternatively, it represents a heterocyclic group, and R is
It represents a pyrimidyl group or a triazyl group which may be substituted with various substituents. ), Specifically, for example, N-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonyl] -4-ethoxycarbonyl-1-methylpyrazole-5-sulfonamide (hereinafter , Compound A)), methyl-2-
[[[[[(4,6-dimethoxypyrimidin-2-yl)
Amino] carbonyl] amino] sulfonyl] methyl] benzoate (hereinafter abbreviated as compound B) and the like.

In the agricultural chemical solid preparation of the present invention, the content of the herbicidal active ingredient and the additive is 0.01 to 30 parts by weight of the herbicidal active ingredient and 0.
It is preferably contained in the range of 01 to 10 parts by weight.

The pesticide solid preparation of the present invention may contain a commonly used surfactant and other auxiliary agents.

The pesticide solid preparation of the present invention can be easily produced by a usual production method for solid preparations such as granules, wettable powders, powders, etc., but is a sulfonylurea herbicidal active ingredient, a vegetable oil or a high boiling solvent, and a mineral substance. It is necessary that the carrier be mixed uniformly. However, at the time of this mixing, it is possible to mix some or all of the other auxiliary agents together, if necessary.

Next, specific examples and test examples of the present invention will be described. However, the present invention is not limited to these examples and test examples.

All parts below refer to parts by weight.

Example 1 Dust 0.07 parts of finely ground compound A, 3 parts of soybean oil and clay
96.93 parts were uniformly mixed and pulverized to obtain the powder agent of the present invention.

Example 2 Wettable powder 10 parts of Compound A, Hisol SAS-296 (a high boiling solvent synthesized from xylene under the trade name of Nippon Oil Co., Ltd. 29
It has a boiling point range of 0 ° C to 305 ° C. 2), 1 part of sodium alkylbenzenesulfonate, 5 parts of lignin sulfonate and 82 parts of diatomaceous earth were uniformly mixed and then pulverized with an air mill to obtain a wettable powder of the present invention.

Example 3 Granules 0.1 part of finely pulverized compound A, 3 parts of linseed oil, 20 parts of bentonite, 74.9 parts of talc and 2 parts of polyvinyl alcohol were uniformly mixed, and 18 parts of water was added to this mixture.
Kneaded This kneaded product was granulated with a 1 mm screen by an extrusion granulator. This was dried at 50 ° C. for 2 hours to obtain the granule of the present invention.

Example 4 Powder agent 0.1 part of finely pulverized compound B and 1 part of Hisol SAS-296 (a high boiling point solvent synthesized from xylene under the trade name of Nippon Oil Co., Ltd., having a boiling point range of 290 ° C. to 305 ° C.)
Part, 1 part white carbon and calcium carbonate 97.9
The parts were uniformly mixed and pulverized to obtain the powder of the present invention.

Example 5 Wettable Powder 10 parts of Compound B, 3 parts of olive oil, 8 parts of alkylallyl sulfonate and 79 parts of kaolin clay were uniformly mixed and then ground in an air mill to obtain a wettable powder of the present invention. It was

Example 6 Granules 0.3 parts of finely ground compound B, Shelsol
-AB (Aromatic hydrocarbons
Contains 99.5%. It has a boiling point range of 290 ° C to 305 ° C. 1), bentonite 10 parts, talc 86.7 parts and polyvinyl alcohol 2 parts were uniformly mixed and then pulverized with a hammer mill. Then, 15 parts of water was added to this mixture and kneaded. This kneaded product is extruded and granulated by 0.9m
Granulated with m screen. This was dried at 50 ° C. for 2 hours to obtain the granule of the present invention.

Comparative Example 1 Granule The same procedure as in Example 3 was carried out except that the linseed oil was removed from Example 3 to obtain the granule of Comparative Example 1.

Comparative Example 2 Granules In Example 6 above, Shelsol-A
The same treatment as in Example 6 was carried out except that B was removed to obtain a granule of Comparative Example 2.

Next, an abuse test was conducted using each of the above-mentioned preparations to examine the stabilizing effect of the solid agricultural chemical preparation of the present invention.

Test Example 1 Abuse Test Each solid preparation obtained in Examples 1 to 6 and Comparative Examples 1 to 2 was used as a sample in this test.

Put the sample in a glass sample bottle with an inner stopper, and
It was placed in a constant temperature oven at ℃, stored for 14 days, and subjected to an abuse test. The content of the herbicidal active ingredient in the sample before and after the test was measured to calculate the rate of change over time (decomposition rate). The results are shown in Table 1.

R: Content of active ingredient in sample before abuse test S: Content of active ingredient in sample after abuse test The content of active ingredient was quantified by an internal standard method by liquid chromatography.

Hysol in Table 1 is Hysol SAS-296, Shelsol is Shelsol-AB, and A of the active ingredient means Compound A and B means Compound B.

As is clear from the results in Table 1, in the case of the solid pesticide formulation of the present invention to which vegetable oils such as soybean oil, linseed oil and olive oil or high boiling point solvents such as Hisol SAS-296 and Shelsol-AB have been added Shows that the decomposition rate is extremely suppressed and stabilized as compared with the formulation of the non-additive comparative example.

Claims (5)

[Claims] 1. A stabilized pesticide solid formulation comprising a sulfonylurea herbicidally active ingredient, a substance selected from vegetable oil or a high boiling solvent and a mineral carrier, which are uniformly mixed. 2. The solid agricultural chemical formulation according to claim 1, wherein the vegetable oil is a substance selected from olive oil, linseed oil, cottonseed oil, soybean oil or corn oil. 3. The high-boiling solvent is one kind or a mixture of two or more kinds of aromatic hydrocarbons, and its boiling point range is 150 to 350.
The solid agricultural chemical formulation according to claim 1, which is a substance having a temperature of ° C. 4. A sulfonylurea herbicidal active ingredient is N-
Claims 1. [(4,6-Dimethoxypyrimidin-2-yl) aminocarbonyl] -4-ethoxycarbonyl-1-methylpyrazole-5-sulfonamide
A solid pesticide formulation as described in the item. 5. A sulfonylurea herbicidal active ingredient is methyl-2-[[[[[(4,6-dimethoxypyrimidine-2
-Ayl) amino] carbonyl] amino] sulfonyl] methyl] benzoate, The pesticide solid formulation according to claim 1.